Nehemiah 10:30
"And that we would not give our daughters unto the people of the land, nor take their daughters for our sons:"
Cross References (ranked by relevance)
Deuteronomy 7:3
Neither shalt thou make marriages with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son.
Exodus 34:16
And thou take of their daughters unto thy sons, and their daughters go a whoring after their gods, and make thy sons go a whoring after their gods.